Why was the narrator embarrassed to teach doodle to walk?

The narrator was embarrassed to teach Doodle to walk because he felt ashamed of having a brother with a disability and worried about how others would perceive them. This embarrassment stemmed from societal expectations and a desire for normalcy, leading him to feel self-conscious about Doodle's limitations. Additionally, he feared that Doodle's struggles would reflect poorly on him as an older brother, adding to his internal conflict. Ultimately, the narrator's pride and insecurities complicated his feelings toward Doodle's progress.